Duplex saw.



C. E. VAN AUK'EN.

,DUPLEX SAW.

APPLICATION FILED JUNE 12, 19 I6- '-RENE'WED JULY 20.1918.

Patented Sept. 3,1918.

5 SHEETS-SHEET1."

mung

c. E. VAN AUKEN.

. DUPLEX SAW. I APPLICATION FILED JUNE 12. 19H). RENEWED JULY 20. I918.

1,%7?,?6. V Patented Sept. 3,1918;

5 SHEETSSHEET 2- i 77663 fiaM/jizzarr C. E. VAN AUKEN DUPLEX SAW.

APPLICATION FILED JUNE 1-2, 1916. RENEWED JULY 20.1918.

6 Patented Sept. 3; 1918.

5 SHEETSSHEET 3- C. E. VAN AUKEN.

4 DUPLEX SAW. APPLICATION FILED JUNE 12'. 191p. RENEWED JULY 20. I918.

1 Patented Sept. 3,1918.

5 SHEETSSHEET 4.

c. E. VAN AUKEN.

DUPLEX SAW.

APPLICATION FILED JUNE i2, ms. RENEWED JULY 20.1918.

Patented Sept. 3, 1918;

5 SHEETSSHEET 5- a 8 r4 L, 5 C

'CLAfiEBl'fiE E. VAN AUKEN,'0F CHICAGO, ILLIJNO IS, ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 GOATS MACHINE TOOL CQMPAN YQINQ, OFNEXVYORK, N. Y., A. CORPORATION OF all DUPLEX saw. I Y I Application meiiiineia .ieiassriaiu 103,159. Renewed July 2o,1s1s. Serial No. 245,967. I

To alt whom it may concern.

Be it known that'l, CLARENCE E. VA Annex, a citizen-of the'United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Duplex Saws, and

declare the following to he a full, clear, and

exact description of the same, such as will enable others skilledin the art to which it pertains to make and use thesame, reference being had to the accompanying drawings, which form a part of this specification.

" 1n the ordinary hack-saw for sawing 'metal, there is a single blade which can cut on only one stroke 'of each cycle, the saw therefore doing efiective work during only half the time that it is running.

The primary object of the presentniVention is to'produce a simple and eliicient saw ing machine of the reciprocating type'which shall saw effectively on all strokes and not simply on half the strokes; thus, giving double the capacity of a single saw.

in carrying out my invention I employ two opposed saw blades which reciprocate I together on opposite sides of the work, have their teeth arranged in opposite directions so that one will cut on the forward stroke and the other on the back ESiZIQkG and are movable from and toward each other to per mit them to he opened to receive a piece of 'work and to approach each other as they saw through the work from opposite sides. In order to prevent waste of material and producing uneven'ends, it is necessary that the saws he in the same plane. vlewedln.

one of its aspects my, invention may be regarded as having for its ob ect to produce a SllIlPlQ'filEfillS for maintaining two opposed relatively movable saws in accurate alinement w th each other.

Where two opposed saws lying in thesame plane are employed it is of course not practicable to let the opposed teeth ap proach'each other so'closely that they will V cutqcompletely' through the work without engaging with each other and destroying each other, because tl e ordinary. c'oi'nn'iercial'sa'ws that are used will vary considerably in width when new and of course they will diminish in width while in use, so

' that even if the saws-can be so accurately made thatthe teeth would just cut throughlength of time after the-saws were in use.

Patented Sept. 3, 19 1s.

The mechanism must therefore be so' constructed that the teeth of the opposed saws will at all tunes remain at some d stance apart so as to avo d the danger of destruction of the saws through engagement of the teeth of one with those oi? the other.

Viewed in one of its aspects my invention may be :said to have for its object to .pro-

duce a simple and eiiicient construction and arrangement by -means of which two Ops posed saws may be made to pass completely through an interposed piece of work, 111

registration witheach other, without danger of bringing the teeth in contact. with each other and without leaving an unsev cred portion at the middle of the work.

Viewed in another of its aspects my invent-lon'may be said to have for ltSObJECl] to produce a simple andnovel saw in wh ch the pressure on a saw member during a cutregulated within wide limits. 7 a ,7 Viewed in another-0t its aspects, my invention may be said to have for its object ting stroke may be easily and conveniently to produce a simple and efiicient arrange-,

ment by means of which a continuous flow of cooling and lubricating fluid over a saw or saws will. be maintained during the operation of. a sawing machine.

The various features of novelty whereby my invention 1s characterizedwill herein;

after he pointed out with particularityi i the claims; but, for a full understanding of my invention and 'of its objects and advantages, reference may be had'te the following-r machine taken at right-angles to the plane of Fig. 1; 1

Fig. 3 is a front elevation on an enlarged scale of a portion of the mechanism for controlling the pressure on the saw blades and feeding them toward each other;

shown in section with the front wa I omitted; Y Fig.- 2 is a vertical section throughthe Fig. 4 is a section taken approximately;

on line 44 of Fig, 3;

Fig. 5 is a section taken approximately on line 55 of Fig. 3;

Fig. 6 is a front elevation of the ,fiw

.with the front portions of the feeding ranged to cut on the down stroke.

clutch removedand exposed parts normally concealed;

Fig. 7 is a View similar to Fig. 6 illustrating the saws spread apart to receive a piece of work Fig. 8 1s a vertical section on an enlarged scale through a portion of one of the saw frames, showingthe means for feeding the lubricating and cooling fluid;

Fig. 9 is a side viewon. an enlarged scale of the friction connection between the saw frames and the mechanism for feeding the saws toivard each other} Fig. 10 is a section taken approximately on line 1010 of Fig. 9 and Fig. 11 is a front view of the device illustrated in Fig. 9 looking at the device from the right hand side of the latterfigure. Referring to the drawings, 1 represents the supporting frame or base of themachine in the form of a casing or shell adapt ed to contain a considerable quantity of cooling and lubricating fluid. ()n the rear side of the casing is a driving device illustrated as taking the form of a pulley, 2, whose shaft projects into the casing and is provided with a crank, 3. Below the crank is fixed a vertical guide, 4, on which is slid- 'ably mounted a suitable cross head, 5. lietween the crank and the cross head is a connecting'rod, (3; the arrangement being such that when the crank is rotated the cross head is reciprocated in the vertical direc-,

of the saw frames consists conveniently of a lower member in the form'of a web-like casting, 8; the two castings lying. in the Same plane with their-inner edges adapted to be brought in close' proximity to each other. Extending upwardly along the outer edge of'eaeh of the castings is a post, 5), rigidly secured to the casting and projeg ing upwardly out of the top' of the casing; e'fi'ch post being provided at its upper end lwiih a head, 10, projecting inwardly toward and adapted to engage with the head on the oppositeipost when the two frames tire swung together. Saw blades, 11 and 12, such are ordinarily employed in hack saws, are arranged between the headsand the upper inner corners of the castings 8;

the saws being revei'scly arranged so that the teeth of one are set to cuton the up stroke while the *teeth of the other are ar-.

parts are soproportioned that when :the

' eral grooves,

The'

time come in contact with .eaeh othc' and damage the machine.

' Ifthe saws are operatedin a dry state they must be run-very slowly in order that. they will not become overheated; and, by providing for the effective cooling and lubrication of the saws the capacity of the machine is substantially doubled. Therefore, in-order'.-that the machine may be run.

. Referring to this figure, it will be seen that the )0st 9 consists of a )i )e or tube )r0- 1 l l l ecltin throu 'hand screw threaded intoor.

otherwise secured to an ear, 13. on the cast ing 8, a valve casing, 14, containing an inwardly-openmg check valve, 15, being se-- .cured to the lower end of the post and.

where. the post is screwed'in place, serving conveniently as a lock.

Near the upper end of the tubular post The member 19 has a sliding lit in the bore 18 and is provided on its upper end with a screw threaded part, 20, on ,which is a nut. 21, resting upon the top of the head 10 and forming a closure for the upper end of the bore 18. The member 19 is provided with suitable passageways ,adapted' to register with the passage 17. In the arrangement shown, llicsen passageways are formed by cutting in the member 19 a series of periph- 22, extending around the same just below -the screw threaded portion, together with a longitudinal groove, 23, extending from the seat for the saw blade up through the flanges or collars, 24, produced by the grooves, 22. This arrangement permits the member 19 to'be. adjusted vertically for a considerable distance without in ter-rupting communication between the passages 17 and 23' amtwitlioul making the.

bearing of the mem'ber ill-in the head too.

short; the collars orflanges,

2i. acting as effective bearing membcrs.

j I thetwobars to be held together so as 60 slidable one upon the other.

arness as follows: As the frames move downward in the lubricating liquid, some the "liquid is forced up into the hollow posts and is retained there. After a sufficient number a of strokes have been made to tilt the tubular posts, the next succeeding stroke will cause an overflow of the lubricating and cooling --liquid through the passages in the heads and the saw supports, 19, the liquid being discharged directly upon the upper ends of the saws so'that they are edectively'cooled and lubricated.

The rate at which the cooling and lubricating fluid is delivered to the saws may be 16 controlled by suitable valves which, in the arrangementshown, take the form of screw threaded plugs 25, extending down through the heads 10 into the upper ends of the hollow posts and-governing the edective area 20 of the opening'lti. A

The' saws are kept accurately in alinement with each other by means of a bar, 26, extending transversely across the saw frames,

7 preferably across the members 8 thereof;

this bar being provided with suitable pin and slot connections which permit the saw frames to be swung from and toward each' otherf about their pivotal axes without being capableof relativemovementsin a di- 80 rection to bring the saws out of alinemcnt with g, each other. In the arrangement shown, the bar is provided with two elongated slots, 27, through which pass headed screws, 28, supported at their inner ends by the members 8.

' 'On the'outer side of each saw frame is a lever,'30, which preferably is 'a grooved roller, 31, engaging with the corresponding post 9 to form a guide for the reciprocating to frame as well as a pressure member adapted to feed the sawinto the worlr. These levers may take any suitable form as long the parts which engage the saw frames are adapted to swing from and toward each an other. In the arrangement shown, each of the levers consists of a simple bar pivotally supported between its ends, indicated at 32, on the upper portion of the stationary frame of the machine. To the lower end of to the lower arm of each lever is connected a bar which may conveniently be a simple rectangularpiece as indicated at 33; the two bars lying side by side and overlapping each other for the greater portion oft/heir length when the saws are close together. df desired,

each bar may be provided on is inner free end with a saddle. or clip, 34, slidably engaging 'with the other bar and thus causing to be 7 Embracing the middle oijythe overlapping bars, 33, is a grip ping device adapted to grip either bar securely and leave the other bar entirely free to reciprocate independently of the gripping to device. As best shown in Figs. 4 to 7 inclusive, the gripping device consists simply of a housing, 85, surrounding the bars and containing in the upper portion thereof two blocks, 36, held in place by a pin, 37, pass ing through the housing and through the blocks midway between the ends of the latter and permitting the bloclrs to rock, each in the plane of one of the bars 33'. In the housing, on the under side .of the bars, are

pair of short blocks, 38 and 39, respectively, the block, 38, underlying the front bar and being pivotally supported at its left hand end as indicated at .40 while the block 39 underlies therear bar and is pivotally connectedto the gripper casing or housing at its right hand end as indicated at 4:1. It wiilbe seen that by reason of the disposition of the pivotal points, 37, a0 and 41, at the three corners of a triangle, a tilting of the gripping device in one direction will cause one of the long blocks and one of the short blocks to grip one of the'barswhile the blocks of the other setsimply yield and leave the corresponding bar free. In other words, viewing the device as illustrated in Fig. .7, if the gripping device he turned in the clockwise direction or if it be attempted to turn it in that direction, the tendency is to make the vertical distance between the pivotal-points 37 and to smaller than it is 98 in the neutral position and at the same time make the vertical distance between the pivotal points 37 and 41 greater than it is in the neutral position. Thus the front bar will be gripped and the other bar will be 100 left free. If the gripper-be tilted in the opposits direction, a reversal of the process just described takes place. I

T employ the gripper, just described, for the purpose of alternately holding the saws 5 against the work and feeding them into the work. To this end I have provided the following mechanism: On the stationary frame of the machine, at one side of the'center, is placed a rocker device, 42, connected by a 33th link, 4.3, to the lower end of the gripper. The rocker device may consist of a simple lever pivotally supported betweenits ends as indicated at 43 the lower end being a simple arm and the upper end a hub-like 5 projection, 44, through which extends a transverse actuating arm, 45.; the actuating member being preferably slidable in the member 44 for a purpose which will herein after appear. The actuating arm plays between a pair of stops, 46 and 47, best shown in Fig. 1, it being moved up and down by means of a suitable driving connection with the saw frames. This driving 1 connection conveniently consists of a connecting rod extending from the wrist pin 7 to a sleeve or block, 458, attached to the actuating arm; the connecting rod being extensible and-having africtionally held slip joint. With this arrangement,as the saws move up'and down, 189

theactuating arm oscillates and produces an oscillatlng movement In the rocker device 42. The parts are so proportioned that when the actuating arm lies halfway be position toward the upper stop, the left hand saw is acted upon and the right hand saw is left free. It will be seen that as the saws travel down, the connection between the arm 45 and the saw frames causes the arm to be swung down and thus causes the right hand saw to be fed into the work while as the saws move ,upwardly the actuating arm is moved in a direction to cause the left hand saw to be fed into the work. The right hand saw, 11, is therefore set so that it will cut on the down stroke while the left hand saw, 12, is set so that it will cut on the up stroke.

It will be seen that the gripper does not merely grip and hold the bars associated with the sawlcontrolling levers but actually feeds these bars in the proper direction to cause the saws to feed into the work. Furthermore, when the saw frames are brought together as shown in Figs. land (3 and the machine is set in operation the center line between the saws will be caused to oscillate across the vertical center line of the machine; this peculiarity enabling the machine to saw entirely through a piece of work even though the saw blades be spaced a considerable distance apart.

The connectingrod with a slip joint af-' fords a simple means for producing a steady pull .or push on the actuating arm which will insure that the saws will at all times be fed into the work from one end of the stroke to the other.

In the arrangement illustrated, the connecting rod is made of an upper member,

50, pivo ally connected at its upper end to of the body of the member 52 and having.

laterally projecting parts, 55, at the free ends of its arms extending between the arms.

at the top of the member 52 and the arms at' the lower end thereof. Each of the arms, 53, is recessed on its front side to form a tensions, 55, on the member 54.

pocket as indicated at 56. I The members and 54 are held together by means of leaf springs, 57, each of which or each set 0 which extends from one of the upper pockets, 56, into the corresponding lower pocket in rear of one of the flanges or ex- The free end of the connecting rod member 51 is thrust between the members 52 and 54, spreading them apart against the tension of the springs an d being frictionally clamped thereby to the upper connecting rod member 50. The friction 'on the joint may be regulated by varying the number of leaves in each spring or the size of the spring if it should be made only of a single leaf; It will be seen that the friction coupling or joint has the function of compensating for the difference between the extent of movement of the upper end of the connecting-rod and the extent of movement of the lower end of the connecting rod, the up per end moving through a much shorter distance than the lower er.:l when the machine is running idle, and the further function of permitting the actuating arm, 45, to lag behind its normal rate of movement as the saws are fed into the work, thus at all times keeping a pressure on each saw while it is on a sawing stroke, this pressure depending upon the strength and tension of the springs 57. The pressure on the saws and the rate at which they will feed into the work is further regulated by moving the actuating rod, 45, axially through the member H: of the rocker device; thus varying the distance between the pivotal axis, 43, of the rocker device and the point of application of the I projection, (31, projecting forwardly from the gripper casing 35. In the arrangement shown, the centering shoes are mounted on the inner ends of short alined horizontal shafts, (32, each mounted on the lower ends, of two separated downwardly projecting arms, ($3, of a. bracket, (5-1; there being four of these arms spaced apart from each other; the shoes and the pin, (31, lying between the two innermost arms and each of the shafts, ($2, being slidably supported in one of the inner arms and the corresponding outer arm. On each of the members (32, between the two arms in which it is supported, is a spring, (35, bearing at one end against the corresponding outer arm and at its other end against a shoulder, (36, 911 the shaft Move ment of the gripping device in either direction must therefore take place against the free to do :so, returns its centralposltion. V

lVhenever either of the bars 33 is released by the gripping device, the corresponding saw eontrolling leveris free to be oscillated at will and, 1n order to prevent the levers at out of operative "relation to the-saw frames and thus prevent the saws from being properly fed, I provide springs, 70, arranged between the levers ,30 and the stationary framework of the machine and tending constantly to swing the upper ends of the levers toward each other; these springs having nothing to do with the pressure on the saws while the latter are on the cuttingstroke, because such. pressure will be very much greater than the comparatively slight pressure that could be produced by the holding springs. In other words, the feeding pressure on the saws is a positive drive from the main shaft modified by thefriction joint in the connecting rod and the lever ratios between the main shaft and the points of ,con-

tact between the levers 30 and the saw frames, while the springs, 70, exert simply a slight pull which will hold the levers 30, while freed. from the gripping device, against the corresponding saw framesand thus insure that the saws will take hold, at the very beginning of thesawing strokes.

Normally when there is no work of the machine and it stands idle, the heads of the saw framesare in contact with each other as shown in Fig. 6. lVhen it is desired to introduce a piece of work between the saws,

ithe saw frames are grasped at their upper endsand drawn apart as shown in Fig. 7, thus permitting the work, 71, which is to be sawed to be placed between the saw blades.

On the stationary frame in rear of the saw frames there is arranged a work holding clamp, .72, of any usual or suitable construction.

As heretofore explained, the pressure onthe saws is controlled both by the friction jointin the connecting rod between the actuating arm 45 and the Wrist pin 7 and the position of this arm in the rocker device 42. The ordinary variations in pressure that the workman will desire to make, depending upon the nature of a particular piece of work, will be made simplyby pushing the actuating arm, 45, in or out, the ustment of the friction joint in the connecting rod' being made/only to take care of the general nature of the work that the machine has to do, A simple means for holding the actuating arm, 45, in any adjusted; position consis ts in providing it: with a series of shallow recesses or oekets, 75, distributed lengthwise thereof, and placing in themember 44 ot the ri eker device a spring-held plunger,

76, adap d to eat itself i ny o e of the.

- wIn the drawings I have illustrated only a h times f being fi t dl single design of machine that has been'found to work very successfully in practice and,

chine. It will of course be understood, however, that the details of the machine may be widely varied withoutdeparting from the principle of my invention} and I therefore do not desire'to'be limited to the details of the particular machine illustrated; but intend to cover all forms and arrangements which come Within the termsof the definitions of my invention constituting the appended claims.

I claim:

1. In a machine of the character described, two opposed, alined, reciprocable saws movable from and toward each other independently, pressure devices acting on the saws for the purpose of moving them to ward each other, and means for acting alternately on said pressure devices during successive strokes of the saws so as to release one of the saws from the work and force the other toward the-common center throughout the working stroke.

2. In a machine of the character described, two -opposed alined, reciprocabl'e saws pivotally supported so as to be capable of swinging independently from and toward each other; andnieans for acting alternately on said saws during successive strokes thereof to feed one of the saws toward the other and simultaneously release the latter from the work.

'3/In a machine of the character described, two opposed, alined, reciprocable' saws supported so as to be movable length wise in unison and from and toward each other independently; and means acting alternately on said saws during successive strokes to feed o'netoward the other and simultaneously release the latter.

4. In a machine of the character described, two opposed alined,"1;eciprocable saws supported so as to be movable lengthwise in unison and from and toward each other independently, and driven means tor feeding one of the saws into the work throughout one stroke of each cycle and feeding the other saw into the work throughout the other stroke of each cycle.

5. Ina machine of thecharacter described, two opposed, alined, reeipro'cable saws movable from and toward each other, lever devices. acting on said saws for the purpose of feeding them toward each other, and, means for acting alternately on sand,

. newnesof the center of the stand to receive the work between them, driving means on the stand wherewith the lower parts of the saw fra mes are connected to effect their reciprocation,

continuously-acting intermittent-grip feed mechanism for the saw-frames, and cnnec tions including a friction slip joint between said feed mechanism and the driving means whereby the saws are alternately fed forcr bly toward the common center throughout their respective 'working strokes.

and movable laterally thereon toward and from each other, and constantly and yieldingly driven feed mechanism operating alternately' upon said frames to r'orce first one andthen the other repeatedly toward the common center while executing their respective working strokes.

V 18. A double hack-saw machine, comprising twoopposed saw-frames adapted to receive the work between them, driving mechanism for reciprocating the saw-frames, a

feed device for forcing said saws alternately toward the common center throughouh their respective working strokes,- a positive drive for said feed device, and a friction slip joint for modifying such positivedrive so as to produce asubstantially uniform pressure on the saws.

19. A double hack-saw machine, comprising opposed saw-frames movable lengthwise in the same directions and independently movable laterally, supporting and guiding means for the saw-frames, oscillating intermittent-grip feedmechanism operative alternately upon the saw-frames to force them individually toward the common center whileexccuting their respective working strokes, and power means for reciprocating the saw-frames and operating the feed mechanism in proper time.

, 20. A double hack-saw machine, comprising a vertically-gr:ided common carriage and means for reciprocating the samc,-two opposed saw-frames pivoted tosaid carriage and adapted to he swung from relation toward parallelism the cutting, tproceeds, pressure devices engaging the sawramesas the latter travel relatively thereto, and feed mechanism acting alternately upon' said pressure devices.

'21. A double hack-saw machine, comprising opposed saw-frames, mechanism for driving: the same, and a constantly driven oscillating inter-mittent-grip feed for forcing the saw-frames alternately toward the common center while executing their respective working strokes.

A double haclcs'aw machine, comprising opposed saw-frames, mecl'ianism' for driving the same, oscillating intermittent bore for forcing the saw-frames alternately grip feed means forforci'ng the saw-frames alternately toward the common center while executing their respective working strokes,-. and additional means operative inwardly upon the S1W-ffflll188 to insure properqposi- .7o, tioning for the working strolresqr j 23. A double haclr-saw'machi e, compris ing a driving means, opposedivertically-reciprocating saw-frames p vot-ally connected" at their lower portions w' h said 'drivin'g' 75, means, being initially in di r'gihg relation and swinging inward towardithe,common center as the cutting proceeds, pressure def. vices for acting upon the saw-frames as the latter travel relatively thereto 'on theiP' 80 working strokes, overlapping con nected ivitlrthe pressure devices, and a com mon oscillating teed device c'onn'ected with the driving means and acting upon bars.

2s. A double hack-saw machine, comprising vertically-reciprocating:opposed saws frames, means tor driving the same, ressure devices in contact with which is e; saw-.

frames travel, overlapping bars, connected with the pressure devices, and a commonescillatory intermittent-grip driven feed device upon the overlapping portions of the bars, 1 j i 25; A double haclesaw machine, comprisingvertically-reciprocating opposed sawframes, means for driving the same, ressure devices in contact with which t e-sawframes travel, overlapping bars connected' -W1'i3hl3l18 pressure devices, a common QSClllatory intermittent-grip driven feed device upon the overlapping portions of the bars, and means tendingto centralize the feed device.

26. A double hack-saw machine, c0mprising opposed substantially upright .sawframes mounted so as tobe independently movable laterally, means for reciprocating, the saw-frames, and mechanism including oscillatory driven intermittent-grip ,Inemtoward the common center while executing their working strokes, the saidmechanism. including means whereby each saw-frame is released from the work While on 'its'idle stroke. a I 27. A double hack-sawmachine,.compris ing two pivoted saw-frames adapted to receive the work between them in ll-relation, mechanism for reciprocating the saw-frames up and down, pressure devices adapted to bear upon the frames as they travel relatively thereto, interii'iittent-grip mechanism driven in phase with; the reciprocation of the saw-frames and acting through the pressure devices to force the frames alternately toward the common center throughout their working strokes, means whereby said mechanism also moves the pressure devices away from t e t a e a ter a y, during the r idle strokes, the saws then swinging out- Ward by gravity, and springs connected with the pressure devices for bringing each savvframe back to the Work in readiness for each working stroke.

28. A double hack-saw machine, comprising opposed saw-frames, driving means for reciprocating the same, constantly-driven oscillatory intermittent-grip feed mechanism for forcibly feeding the saws alternafely toward the common center While exeouting their respective Working strokes, a friction slip joint through which said feed mechanism is driven, pressure devices through Which the feed mechanism acts upon the saw-frames, and springs also act ing upon the pressure devices to bring the saws to the Work in readiness for the successive cutting strokes.

In testimony whereof I sign this specification.

CLARENCE E. VAN AUKEN. 

